<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="css/index.css">
</head>
<body>
    <h1>一个web的页面</h1>
    <hr/>
     <div>
        <label for="">请输入用户名:</label>
        <input type="text" id='username'/>
        <button>点我</button>
     </div>
</body>
</html>
<script src='js/index.js'></script>